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chapter 19 vocab
populations
Question | Answer |
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age structure | the classification of members of a population into groups according to age or the distribution of members of a population in terms of age |
agricultural revolution | the change from a hunting and gathering society to an agricultural society that began about 10,000 years ago |
birth rate | the number of births that occur in a period of time in a given area |
carrying capacity | the largest population that an environment can support at any given time |
death rate | the number of deaths that occur in a period of time in a given area |
density- independent factor | a variable that affects a population regardless of the population density such as climate |
density- dependent factor | a variable that affected by the number of organisms present in a given area |
developed country | a modern industrialized country in which people are generally better educated and healthier and live longer than people in developing countries do |
developing country | a country in which the society is less modern and less industrialized and in which inhabitants are generally poorer than they are in developed countries |
demographic transition | the general pattern of demographic change from high birth and death rates to low birth and death rates as observed in the history of more developed countries |
emigration | the movement of a group of people or individuals out of an area |
exponential model | a model of population growth in which a constant and unlimited growth rate results in geometric increases in population size |
growth rate | an expression of the increase in the size of an organism or population over a given period of time |
hunter gatherer lifestyle | a way of life in which people obtain their food by hunting and gathering wild animals and plants |
dispersion | in ecology the pattern of distribution of organisms in a population |
immigration | the movement of an individual or group into an area |
interbreeding | the crossing or mating of plants or animals with close relatives |
life expectancy | the average length of time that an individual is expected to live |
limiting factor | an environmental factor that prevents an organism or population from reaching its full potential or distribution or activity |
logistic model | a model of population growth that assumes that finite resource levels limit population growth |
population | a group of organisms of the same species that live in a specific geographical area and interbreed |
population density | the number of individuals of the same species that live in a given unit of area |
survivorship curve | a graph of the mortality data of a population; indicates the probability that individuals will survive to any given age |